DE4407124B4 - Air filter for an internal combustion engine - Google Patents
Air filter for an internal combustion engine Download PDFInfo
- Publication number
- DE4407124B4 DE4407124B4 DE4407124.8A DE4407124A DE4407124B4 DE 4407124 B4 DE4407124 B4 DE 4407124B4 DE 4407124 A DE4407124 A DE 4407124A DE 4407124 B4 DE4407124 B4 DE 4407124B4
- Authority
- DE
- Germany
- Prior art keywords
- air
- resistance elements
- air filter
- air resistance
- row
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/04—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/024—Air cleaners using filters, e.g. moistened
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/1017—Small engines, e.g. for handheld tools, or model engines; Single cylinder engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
- F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/08—Thermoplastics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S55/00—Gas separation
- Y10S55/28—Carburetor attached
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Luftfilter für einen Verbrennungsmotor, insbesondere einen Zweitaktmotor in einem handgeführten Arbeitgerät, wie einer Motorkettensäge, einem Trennschleifer oder dgl., bestehend aus einem Gehäuse (1) mit einem eine Gehäusewand (9) bildenden Filterelement, über welches Verbrennungsluft in einen Gehäuseinnenraum (7) ansaugbar ist, und mit einer in einer Gehäusewand (10) ausgebildeten Ansaugöffnung (8) zum Anschluss eines Ansaugkanals des Verbrennungsmotors, wobei zwischen der Ansaugöffnung (8) und dem Gehäuseinnenraum (7) Luftwiderstandselemente (20, 21) angeordnet sind, wodurch im Gehäuseinnenraum (7) des Luftfilters (1) ein Reinraum und ein Ansaugvorraum (13) ausgebildet ist, dadurch gekennzeichnet, daß zwischen der Ansaugöffnung (8) und dem Reinraum des Luftfilters (1) zwei in Strömungsrichtung (19) mit Abstand (a) zueinander liegende Reihen (15, 25) aus Luftwiderstandselementen (20, 21) angeordnet sind, daß die Luftwiderstandselemente (20, 21) einer Reihe (15, 25) zur Bildung einer Lücke (16) mit seitlichem Abstand (L) nebeneinander liegen, und daß die Luftwiderstandselemente (20) der einen Reihe (25) in Strömungsrichtung (19) etwa vor den zwischen den Luftwiderstandselementen (21) der anderen Reihe (15) gebildeten Lücken (16) liegen, wobei zwischen den Reihen (15, 25) ein Puffervolumen (14) ausgebildet ist. Air filter for an internal combustion engine, in particular a two-stroke engine in a hand-held working device, such as a motor chain saw, a cutting grinder or the like, consisting of a housing (1) with a filter element forming a housing wall (9), via which combustion air into a housing interior (7) sucked is, and with a in a housing wall (10) formed in the intake port (8) for connecting an intake passage of the internal combustion engine, between the suction port (8) and the housing interior (7) air resistance elements (20, 21) are arranged, whereby in the housing interior (7 ) of the air filter (1) a clean room and a suction pre-chamber (13) is formed, characterized in that between the suction port (8) and the clean room of the air filter (1) two in the flow direction (19) at a distance (a) to each other lying rows ( 15, 25) of air resistance elements (20, 21) are arranged, that the air resistance elements (20, 21) of a row (15, 25) to Forming a gap (16) with lateral spacing (L) side by side, and that the air resistance elements (20) of the one row (25) in the flow direction (19) formed approximately before the between the air resistance elements (21) of the other row (15) Gaps (16) lie, wherein between the rows (15, 25) a buffer volume (14) is formed.
Description
Die Erfindung betrifft einen Luftfilter für einen Verbrennungsmotor, insbesondere einen Zweitaktmotor in einem handgeführten Arbeitsgerät, wie einer Motorkettensäge, einem Trennschleifer oder dgl. nach dem Oberbegriff des Anspruchs 1.The invention relates to an air filter for an internal combustion engine, in particular a two-stroke engine in a hand-held working device, such as a motor chain saw, a grinder or the like. According to the preamble of
Bei einem Verbrennungsmotor, insbesondere einem Zweitaktmotor, treten im Ansaugkanal Gaspulsationen auf, die aufgrund des Aufbaus und der Betriebsweise des Verbrennungsmotors nicht vermieden werden können. Durch diese Pulsationen strömt ein Teil der mit Kraftstoff - beim Zweitaktmotor auch mit Öl - angereicherten Verbrennungsluft entgegen der Ansaugrichtung zurück in den Luftfilter. Der Kraftstoff und/oder das Öl schlagen sich dabei auf der Filterfläche nieder, wodurch die nasse Filterfläche versottet und anschließend verstopft. Hierdurch sind häufige Filterwechsel bedingt.In an internal combustion engine, in particular a two-stroke engine, gas pulsations occur in the intake channel, which can not be avoided due to the structure and the mode of operation of the internal combustion engine. As a result of these pulsations, some of the combustion air enriched with fuel - in the case of the two-stroke engine also with oil - flows back into the air filter against the direction of intake. The fuel and / or the oil settles on the filter surface, causing the wet filter surface to scurry and then become clogged. This causes frequent filter changes.
Um das Austreten eines Ansaugluftrückstromes in den Luftfilter zu minimieren, ist in der
Aus der
Die Klappenwand stellt für den Ansaugluftstrom ein erhebliches Strömungshindernis dar, da die Klappen nur unter Überwindung der Schließfedern zu öffnen sind.The flap wall is for the intake air flow is a significant flow obstacle, since the flaps are only open by overcoming the closing springs.
Die
Der Erfindung liegt die Aufgabe zugrunde, einen Luftfilter der gattungsgemäßen Art derart weiterzubilden, dass ein Feuchtwerden des Filterelementes durch rückströmendes Kraftstoff/Luft-Gemisch verhindert ist.The invention has the object of developing an air filter of the generic type such that a dampening of the filter element is prevented by back-flowing fuel / air mixture.
Die Aufgabe wird erfindungsgemäß nach den kennzeichnenden Merkmalen des Anspruchs 1 gelöst.The object is achieved according to the characterizing features of
Durch die gestaffelte Anordnung von mindestens zwei Reihen aus Luftwiderstandselementen ist ein direkter Strömungsweg von der Ansaugöffnung in den Reinraum des Luftfilters unterbunden. Der zur Ansaugöffnung strömenden Verbrennungsluft ist aufgrund der Gestaltung der auf Lücke zueinander angeordneten Luftwiderstandselemente der inneren und der äußeren Reihe ein widerstandsarmer Strömungsweg geboten, während einem rückpulsierenden Gasstrom von der Ansaugöffnung in den Reinraum des Luftfilters ein hoher Strömungswiderstand entgegengesetzt ist. Der hohe Strömungswiderstand bewirkt eine Verwirbelung, wodurch sich Kraftstoff und Öl an den Luftwiderstandselementen absetzen können, so daß im ungünstigsten Fall in den Reinraum eintretende Anteile des rückpulsierenden Gasstroms einen sehr geringen Kraftstoff- bzw. Ölgehalt haben.Due to the staggered arrangement of at least two rows of air resistance elements, a direct flow path from the suction opening into the clean room of the air filter is prevented. The combustion air flowing to the intake opening is a low-resistance flow path due to the design of the spaced apart air resistance elements of the inner and outer row, while a reverse flow of gas from the suction port into the clean room of the air filter, a high flow resistance is opposite. The high flow resistance causes a turbulence, whereby fuel and oil can settle on the air resistance elements, so that in the worst case in the clean room entering portions of the repulsive gas stream have a very low fuel or oil content.
Bevorzugt ist vorgesehen, daß das zwischen den Reihen der Luftwiderstandselemente ausgebildete Volumen auf das Pulsationsvolumen des mit dem Luftfilter versehenen Verbrennungsmotors abgestimmt ist, so daß der rückpulsierende Gasstrom in dem Puffervolumen zwischen den Reihen der Luftwiderstandselemente abgefangen wird. It is preferably provided that the volume formed between the rows of air resistance elements is tuned to the pulsation volume of the internal combustion engine provided with the air filter, so that the repulsive gas flow is intercepted in the buffer volume between the rows of air resistance elements.
Bevorzugt liegen die Luftwiderstandselemente etwa parallel zur Achse der Ansaugöffnung ausgerichtet, d. h., sie stehen etwa lotrecht auf einer die Ansaugöffnung aufweisenden Ebene. Bevorzugt ist die Reihe der Luftwiderstandselemente etwa ringförmig um die Achse der Ansaugöffnung angeordnet.Preferably, the air resistance elements are aligned approximately parallel to the axis of the intake, d. h., They are approximately perpendicular to a suction port having the plane. Preferably, the row of air resistance elements is arranged approximately annularly around the axis of the intake opening.
Die Luftwiderstandselemente sind insbesondere etwa U-förmig ausgebildet, wobei die Schenkel dem Ringinneren zugewandt liegen. Dabei kann ein Schenkel eines Luftwiderstandselementes der einen Reihe und der Schenkel eines benachbarten Luftwiderstandselementes etwa auf einer gemeinsamen Radialen liegen. Um ein Mitreißen von auf den Luftwiderstandselementen niedergeschlagenem Kraftstoff und Öl durch einen Ansaugstrom zu begünstigen, sind die freien Enden der Schenkel bevorzugt verjüngt ausgebildet.The air resistance elements are in particular approximately U-shaped, with the legs facing the ring interior. In this case, a leg of an air resistance element of one row and the legs of an adjacent air resistance element may lie approximately on a common radial. In order to promote a entrainment of deposited on the air resistance elements fuel and oil by a suction flow, the free ends of the legs are preferably formed tapered.
In besonderer Weiterbildung der Erfindung ist innerhalb des inneren Rings im Fußbereich der Luftwiderstandselemente eine Einlage aus saugfähigem Material wie Schaumstoff oder dgl. angeordnet. Diese Einlage dient dem Sammeln und Speichern der von den Luftwiderstandselementen abfließenden Kraftstoff- und ölanteile. Um deren Rückführen in den Ansaugluftstrom zu begünstigen, ist vorgesehen, an der Einlage als Speichervolumen einen Körper aus saugfähigem Material wie Schaumstoff oder dgl. anzuordnen, der sich im wesentlichen in Richtung der Höhe der Luftwiderstandselemente, vorzugsweise im Bereich des inneren Ringes, erstreckt. Durch seine Anordnung liegt eine Seitenfläche des Speicherkörpers der Ansaugöffnung zugewandt, so daß die über die Ansaugöffnung abströmende Verbrennungsluft an dem Speicherkörper vorbeistreift und gespeicherten Kraftstoff und Öl aufnimmt und abführt.In a particular embodiment of the invention, an insert of absorbent material such as foam or the like is arranged within the inner ring in the foot region of the air resistance elements. This insert is for collecting and storing the fuel and oil components flowing away from the air resistance elements. In order to favor their return into the intake air flow, it is provided to arrange on the insert as storage volume a body of absorbent material such as foam or the like, which extends substantially in the direction of the height of the air resistance elements, preferably in the region of the inner ring. By its arrangement, a side surface of the storage body faces the suction opening, so that the combustion air flowing off via the intake opening flows past the storage body and absorbs and removes stored fuel and oil.
Weitere Merkmale der Erfindung ergeben sich aus den weitem ren Ansprüchen, der Beschreibung und der Zeichnung, in der ein nachfolgend im einzelnen beschriebenes Ausführungsbeispiel der Erfindung dargestellt ist. Es zeigen:
-
1 eine Draufsicht auf ein erstes Gehäuseteil eines Luftfilters, -
2 einen Schnitt längs der Linie B-B in1 , -
3 einen Schnitt längs der Linie C-C in1 , -
4 eine Draufsicht auf ein zweites Gehäuseteil des Luftfilters, -
5 einen Schnitt durch einen aus den Gehäuseteilen der1 und4 zusammengesetzten Luftfilter.
-
1 a plan view of a first housing part of an air filter, -
2 a section along the line BB in1 . -
3 a section along the line CC in1 . -
4 a plan view of a second housing part of the air filter, -
5 a section through one of the housing parts of the1 and4 composite air filter.
Der im Ausführungsbeispiel dargestellte Luftfilter
Die zusammengefügten Gehäusehalbschalen
Der die Ansaugöffnung
Wie in der Draufsicht gemäß
Wie
Wie insbesondere aus
Im gezeigten Ausführungsbeispiel sind die Luftwiderstandselemente
Im zusammengebauten Zustand muß die in Pfeilrichtung
In
Die gestaffelte Anordnung von mindestens zwei Reihen
In Weiterbildung der Erfindung ist im Wandbereich
Der gezeigte Luftfilter
Claims (15)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4407124.8A DE4407124B4 (en) | 1994-03-04 | 1994-03-04 | Air filter for an internal combustion engine |
US08/398,116 US5503649A (en) | 1994-03-04 | 1995-03-03 | Air filter for an internal combustion engine |
FR9502490A FR2716934B1 (en) | 1994-03-04 | 1995-03-03 | Air filter for a heat engine. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4407124.8A DE4407124B4 (en) | 1994-03-04 | 1994-03-04 | Air filter for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
DE4407124A1 DE4407124A1 (en) | 1995-09-07 |
DE4407124B4 true DE4407124B4 (en) | 2018-10-31 |
Family
ID=6511791
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4407124.8A Expired - Lifetime DE4407124B4 (en) | 1994-03-04 | 1994-03-04 | Air filter for an internal combustion engine |
Country Status (3)
Country | Link |
---|---|
US (1) | US5503649A (en) |
DE (1) | DE4407124B4 (en) |
FR (1) | FR2716934B1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19721427A1 (en) * | 1997-05-22 | 1998-11-26 | Mann & Hummel Filter | Sieve element |
DE29922748U1 (en) * | 1999-12-24 | 2000-03-09 | Andreas Stihl AG & Co., 71336 Waiblingen | Arrangement of an air filter and a membrane carburetor |
DE10016430B4 (en) * | 2000-04-01 | 2016-02-18 | Andreas Stihl Ag & Co. | Air filter housing with baffle |
DE10211404B4 (en) * | 2002-03-15 | 2015-02-19 | Andreas Stihl Ag & Co. | Portable, hand-held implement |
JP3595311B2 (en) * | 2002-03-28 | 2004-12-02 | 川崎重工業株式会社 | Engine air cleaner |
US6857399B2 (en) * | 2002-08-12 | 2005-02-22 | Tecumseh Products Company | Air cleaner assembly for internal combustion engines |
DE102006013602B4 (en) * | 2006-03-24 | 2023-08-17 | Andreas Stihl Ag & Co. Kg | Air filter arrangement for an internal combustion engine |
JP5088955B2 (en) * | 2008-02-04 | 2012-12-05 | 株式会社やまびこ | Air cleaner for stratified scavenging two-cycle internal combustion engine |
RU2511910C2 (en) * | 2010-01-14 | 2014-04-10 | Хускварна Аб | Air inlet system for internal combustion engine |
DE102010015049B4 (en) * | 2010-04-15 | 2013-11-21 | Wacker Neuson Produktion GmbH & Co. KG | Oil return device for internal combustion engines |
JP6407550B2 (en) * | 2014-04-03 | 2018-10-17 | 株式会社やまびこ | Anti-blow structure |
BR112016027956B1 (en) * | 2014-06-18 | 2022-01-25 | Mann+Hummel Gmbh | FILTER AND FILTER DEVICE |
WO2016197135A1 (en) | 2015-06-05 | 2016-12-08 | Mtd Products Inc | Blower with intake closure |
JP6556523B2 (en) * | 2015-06-24 | 2019-08-07 | 株式会社やまびこ | Air cleaner for stratified scavenging two-cycle internal combustion engine |
US10851741B1 (en) * | 2018-08-01 | 2020-12-01 | Arlen Ness Enterprises, Inc. | Air cleaner backing plate assembly with crankcase breather vents |
KR20210150754A (en) * | 2020-06-04 | 2021-12-13 | 현대자동차주식회사 | Air cleaner for vehicle |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3856490A (en) | 1973-08-27 | 1974-12-24 | L Heintzelman | Baffle filters for carburetors |
DE3424774A1 (en) | 1984-07-05 | 1986-01-16 | Fa. Andreas Stihl, 7050 Waiblingen | TWO-STROKE ENGINE |
US4838909A (en) | 1988-09-06 | 1989-06-13 | Textron, Inc. | Cartridge air filter and method of making the same |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR603048A (en) * | 1926-04-07 | |||
US1447160A (en) * | 1923-02-27 | Device | ||
US1678044A (en) * | 1926-03-08 | 1928-07-24 | Int Motor Co | Air filter |
GB712542A (en) * | 1951-03-30 | 1954-07-28 | Raymond Henri Pierre Devaux | Improvements in or relating to separation of dust from air |
US3057335A (en) * | 1960-04-11 | 1962-10-09 | Osborne Associates | Preinduction means and method for treating a fuel air mixture |
US3740932A (en) * | 1971-05-10 | 1973-06-26 | Petersen Ross K | Air pre cleaner |
US3792573A (en) * | 1972-04-06 | 1974-02-19 | L Borsheim | Air cleaning structure |
JPS60134861U (en) * | 1984-02-20 | 1985-09-07 | 株式会社 共立 | air cleaner |
DE3433622C2 (en) * | 1984-09-13 | 1995-04-27 | Mann & Hummel Filter | Filter insert for air filters used in dusty operation for internal combustion engines, compressors and other air-sucking machines |
JPS61275561A (en) * | 1985-05-29 | 1986-12-05 | Honda Motor Co Ltd | Air-cleaner |
DE3546028C2 (en) * | 1985-12-24 | 1995-09-28 | Stihl Maschf Andreas | Air filter for an engine device |
US4834784A (en) * | 1988-09-06 | 1989-05-30 | Textron, Inc. | Air filter choke valve method and spitback shield |
DE4241586C1 (en) * | 1992-12-10 | 1994-01-27 | Mann & Hummel Filter | Air filter |
-
1994
- 1994-03-04 DE DE4407124.8A patent/DE4407124B4/en not_active Expired - Lifetime
-
1995
- 1995-03-03 US US08/398,116 patent/US5503649A/en not_active Expired - Lifetime
- 1995-03-03 FR FR9502490A patent/FR2716934B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3856490A (en) | 1973-08-27 | 1974-12-24 | L Heintzelman | Baffle filters for carburetors |
DE3424774A1 (en) | 1984-07-05 | 1986-01-16 | Fa. Andreas Stihl, 7050 Waiblingen | TWO-STROKE ENGINE |
US4838909A (en) | 1988-09-06 | 1989-06-13 | Textron, Inc. | Cartridge air filter and method of making the same |
Also Published As
Publication number | Publication date |
---|---|
DE4407124A1 (en) | 1995-09-07 |
FR2716934B1 (en) | 1996-06-28 |
US5503649A (en) | 1996-04-02 |
FR2716934A1 (en) | 1995-09-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
R071 | Expiry of right | ||
R409 | Internal rectification of the legal status completed | ||
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